Antitumor Action of Seminal Ribonuclease, Its Dimeric Structure, and Its Resistance to the Cytosolic Ribonuclease Inhibitor
Biochemistry2001Vol. 40(12), pp. 3492–3496
Citations Over TimeTop 20% of 2001 papers
Antonella Antignani, Mariarosaria Naddeo, Maria Vittoria Cubellis, Aniello Russo, Giuseppe D’Alessio
Abstract
Bovine seminal RNase (BS-RNase) is a homodimeric enzyme with a cytotoxic activity selective for tumor cells. In this study, the relationships of its cytotoxic activity to its dimeric structure and its resistance to the cytosolic RNase inhibitor (cRI) are investigated systematically by site-directed mutagenesis. The results show that (1) the dimericity of BS-RNase is essential for its full cytotoxic action; (2) the role of the dimeric structure in the antitumor activity is that of making the enzyme insensitive to the cytosolic RNase inhibitor; (3) a RNase may not be completely insensitive to cRI to exploit a full cytotoxic potential.
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